PLATE IV. 



Fig. 

 1. Trigonia Scarbuiyensis, ~Lyc. Left valve, Cornbrash, Scarborough. (Page 31.) 



2,3. „ ,, Opposite valves of the same specimen. 



4. ,, ,, Young example. 



5. „ Juddiana, Lye. Kimmeridge Clay, Market Rasen ; example with few 



costae and large tubercles. (Page 25.) 



7. „ „ Example with more numerous costse and smaller tubercles. 



G. „ Moretoni, Mor. and Lye. Cornbrash, Appleby, Lincolnshire; adult 



specimen. (Page 47.) 



8. „ Bronnii, Ag. A variety from the Lower Calcareous Grit of Weymouth. 



(Page 23.) 



